Can someone explain this to me? a couple of the mintings have confirmed but most of them are saying "Generated but not accepted" What does that mean when it comes to PoS no one else has the same coins right? Does PoS still do the whole finding blocks thing?

https://dl.dropboxusercontent.com/u/7949294/2014-09-07%20-%2005.37.51%20%7E%20capture.png